How do you enlarge screen in USB mode in BX300 sony Bravia tv?

PowerPoint

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The resolution of the video determines how large it will be on the screen. If you have a video that is 1980x1080 pixels, it will fill up the whole screen.

PPT or PowerPoint files cannot be played on any television. You will need to convert the graphics of the file to still JPG photos, or AVI or MPEG video files.